Galaxy Distances using Tully-Fisher

The distance to the spiral galaxy NGC7331 can be estimated using the Tully-Fisher Relationship. In this activity we will calculate the distance to this spiral galaxy. Students will determine the rate of rotation of the galaxy, revealing its mass and likely luminosity. The apparent magnitude of the galaxy, as viewed from Earth can be used with the absolute magnitude to find the distance to NGC7331.

Age Range: 14-18
Prep. Time: 30 minutes
Lesson Time: 1 hour
Cost per activity: Low (printing costs)
Includes the use of: Calculator, pen, ruler, etc.

Teacher Guide and Model Answers

Student Guide

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